Yoga Sūtra Chapter Two verse 43

कायेन्द्रियसिद्धिरशुद्धिक्षयात् तपसः ॥४३॥

kāya-indriya-siddhiḥ aśuddhi-kṣayāt-tapasaḥ ||43||

From self-discipline impurities diminish
and accomplishment in the body and senses.

kāya - bodyindriya - sensessiddhi - accomplishmentaśuddhi - impuritykṣaya - diminish, wasting or wearing awaytapas - self-discipline